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Fix os.read / os.read_entire_file

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- DWORDs are NOT i32
- os.read didn't correctly read as much as it could
This commit is contained in:
Tetralux
2020-03-12 22:31:00 +00:00
parent e0a370f8f1
commit 1181d7cf90
3 changed files with 24 additions and 26 deletions
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core/os/os_windows.odin
+14 -16
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@@ -123,14 +123,14 @@ close :: proc(fd: Handle) -> Errno {
write :: proc(fd: Handle, data: []byte) -> (int, Errno) {
if len(data) == 0 do return 0, ERROR_NONE;
single_write_length: i32;
single_write_length: u32;
total_write: i64;
length := i64(len(data));
for total_write < length {
remaining := length - total_write;
MAX :: 1<<31-1;
to_write: i32 = min(i32(remaining), MAX);
to_write: u32 = min(u32(remaining), MAX);
e := win32.write_file(win32.Handle(fd), &data[total_write], to_write, &single_write_length, nil);
if single_write_length <= 0 || !e {
@@ -145,23 +145,21 @@ write :: proc(fd: Handle, data: []byte) -> (int, Errno) {
read :: proc(fd: Handle, data: []byte) -> (int, Errno) {
if len(data) == 0 do return 0, ERROR_NONE;
single_read_length: i32;
total_read: i64;
length := i64(len(data));
read := 0;
for {
to_read := u32(min(1<<29-1, len(data)-read));
if to_read <= 0 do break;
for total_read < length {
remaining := length - total_read;
MAX :: 1<<32-1;
to_read: u32 = min(u32(remaining), MAX);
e := win32.read_file(win32.Handle(fd), &data[total_read], to_read, &single_read_length, nil);
if single_read_length <= 0 || !e {
err := Errno(win32.get_last_error());
return int(total_read), err;
n: u32;
ok := win32.read_file(win32.Handle(fd), &data[to_read], to_read, &n, nil);
if !ok {
return int(read), Errno(win32.get_last_error());
}
total_read += i64(single_read_length);
read += int(n);
}
return int(total_read), ERROR_NONE;
return int(read), ERROR_NONE;
}
seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Errno) {